Abstract: A new nearly complete specimen of Diandongosaurus acutidentatusShang et al., 2011 is described from the Upper Member of the Guanling Formation (Anisian, Middle Triassic) of Luoping, Yunnan Province. With the new information derived from the new specimen, some elements of the skeleton that were either uncertain or controversial in the previous studies areconfirmed and discussed, and the diagnosis of D. acutidentatus is revised. The result of our phylogenetic analysis suggests that Diandongosaurus is an eosauropterygian, closely related to the Eusauropterygia.

摘要： 记述了产自云南省罗平县中三叠世安尼期关岭组上段一件近乎完整的利齿滇东龙(Diandongosaurus acutidentatus)新标本。根据该标本所提供的新信息，讨论了部分前人研究中不确定或者存在争议的骨骼特征，并重新厘定了滇东龙的鉴定特征。分支系统学分析表明滇东龙属于始鳍龙类，且与真鳍龙亚目的亲缘关系较近。